But in a surprise, court majority agrees to not block federal EPA GHG emissions rule from taking effect as it weighs opponents legal challenge to the mandate.

Justices will rule on arguments against EPA "generic" effluent discharge permitting, but declined to consider landowners' eminent domain challenge on the Mountain Valley gas pipeline.

Supreme Court justices will weigh lower court rulings in a Hawaii-based dispute over treated sewage carried to the ocean through groundwater.